Abdur Rahman bin Ziyad عبد الرحمن بن زياد بن أنعم · The Book on Salat (Prayer)

"Allah's Messenger ordered me to call the Adhan for the Fajr prayer. I called the Adhan, then Bilal wanted to call the lqamah. Allah's Messenger said: 'Indeed the brother from Suda' has called the Adhan, and whoever calls the Adhan he calls the Iqamah.'"

Allah's Messenger (S) said: "Teach the boy Salat when he is seven years old, and beat him (if he does not pray) when he is ten."